PT100 sensor on Duet2 sporadically hunting for target temp

Veti

@mitch said in PT100 sensor on Duet2 sporadically hunting for target temp:

I am also getting heater faults during prints because it is not staying on temp.

please post the exact message you are getting.

did you use a special M570 command?

mitch

I apologize. Let me be more clear.

I believe I have two heater related issues.

It seems to not progress in my macros because it is hunting to hit target temp even thought it is within 2.5C
I have sporadic heater faults during prints. I need to capture more data on this to troubleshoot it. I have just returned to prints to find the print paused and a heater fault.

Special M570 command?

Veti

https://duet3d.dozuki.com/Wiki/Gcode#Section_M570_Configure_heater_fault_detection

mitch

@Veti Thanks,

Nope, no M570 defined in config.g or config_override.g files.

Veti

but it does get past the M109 when you print something?

mitch

Yes it does.

I commented out the Tone generation and I saw this particular macro get to about line 79 and then it just drops out. Again, I think I have a few issues going on here so the troubleshooting is a bit confusing. I am trying to rule some variables out.

; Helps guide leveling the bed mechanically, and calibrate the ZProbe trigger height before running a grid bed compensation routine..
;

; Preamble to tell the user to prepare the printer before continuing
;
;M291 P"Before proceeding make sure the printer is mechanically sound and properly functioning." R"Prepare printer for leveling routine" S3 ; User must click OK
;M291 P"ZProbe should be configured and working. Clear the print bed of any obstacles or debris." R"Prepare printer for leveling routine" S3 ; User must click OK
;M291 P"This routine will take about 10-20 minutes and heat both the bed and nozzle." R"Prepare printer for leveling routine" S3 ; User must click OK
;M291 P"You will need a piece of paper. Filament will be unloaded." R"Prepare printer for leveling routine" S3 ; User must click OK
;M291 P"Make sure you have successful Gcodes logged to the console before proceeding." R"WARNING" S3 ; User must click OK or cancel
;M291 P"Make a note of your M558 Z value and backup current heightmap before proceeding." R"WARNING" S3 ; User must click OK or cancel

M929 S1 ; start logging 

; Clear compensation map and Zprobe trigger height
;
M291 P"Grid bed compensation map will be disabled. Ok or Cancel?" R"WARNING" S3 ; User must click OK or cancel.
M561			; Disable any current bed compensation
G29 S2			; Clear mesh bed compensation perameters
G31 Z0			; Reset zprobe trigger height

; Heat up bed and nozzle to PLA temps in prep for filament removal and probing
;
M291 P"Bed and nozzle will preheat and home all axis." R"Preheat and Home" S3 T0 ; User must click OK or cancel
M104 S130		; Set nozzle to 130 and release
M140 S55		; Set bed to 55 and release

; home all axis
;
G28 XY
G28 Z       ; Home all axis
G90			; Absolute positioning
T0			; Activate first tool

; Set lower speeds for Z homing and lower Z motor current
;
M566 Z10			; Set maximum instantaneous speed changes (mm/min) (Jerk)
M203 Z400			; Set maximum speeds (mm/min)
M201 Z100	 		; Set maximum accelerations (mm/s^2)
M913 Z40			; Drop motor current to prevent damage in case of head crash

; Move nozzle forward for filament removal
;
;M291 P"Moving nozzle to the front for filament removal and cleaning." T0
;G1 X50 Y5 Z100		; Moves print head to front left and drops the bed down for easy access
;M109 S130		; Set nozzle to 130 and wait

; Tone to get user attention
;
;M400			; Clear movement buffer so tones play reliably
;M300 S666 P500
;G4 P501
;M300 S1111 P300
;G4 P301

; Unload filament and clean nozzle
;
;M291 P"Unload filament if loaded and clean nozzle, then press OK to continue" R"Unload Filament" S3 T0 ; User must click OK or cancel

M702			; Unload Filament

; Preheat to probing temps
;
M291 P"Preheating the bed to 60 and nozzle to 210 for accurate probing" T0
M104 S210		; Set nozzle to 210 and release
M190 S60		; Set bed to 60 and wait
M109 S210		; Set nozzle to 210 and wait

; Tone to get user attention
;
;M400			; Clear movement buffer so tones play reliably
;M300 S666 P500
;G4 P501
;M300 S1111 P300
;G4 P301

; Move nozzle to center of bed at Z10 and drop to Z1
;
M291 P"Nozzle will now move to center of bed and move close to the bed" T0
M98 P/macros/general/1_Center_Nozzle ;P move to bed center

; Reset z to 8 to allow jogging up to touch bed to nozzle
;
G92 Z8

; Dialog to allow user to job z to touch nozzle to bed gently and then move Z down 10
;
M291 P"Carefully Jog the Z Axis until the bed and nozzle are touching and click OK" R"Setting Z=0" Z1 S3
G92 Z0      		; set z = 0

; Move nozzle to leveling points and prompt user to level bed at each
;
M291 P"Nozzle will now move to the 4 leveling points twice." S1 T2

; Move to leveling point 1
G1 Z2      		; move to z2 for travel
G1 X26 Y25 F6000	; Move to front left corner

M400
M291 P"Adjust point 1 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension." R"Adjustment Point 1" S2 Z1

; Move to leveling point 2
G1 Z2			; Move to Z2 for clearance
G1 X195 Y195 F6000	; Move to rear right corner

M400
M291 P"Adjust point 2 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension." R"Adjustment Point 2" S2 Z1

; Move to leveling point 3
G1 Z2			; Move to Z2 for clearance
G1 X195 Y25 F6000	; Move front right corner

M400
M291 P"Adjust point 3 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension." R"Adjustment Point 3" S2 Z1

; Move to leveling point 4
G1 Z2			; Move to Z2 for clearance
G1 X26 Y195 F6000	; Move rear left corner

M400
M291 P"Adjust point 4 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension." R"Adjustment Point 4" S2 Z1

; Repeat to verify
;
M291 P"The adjustment sequence will now repeat for fine adjustment." S1 T2

; Move to leveling point 1
G1 Z2      		; move to z2 for travel
G1 X26 Y25 F6000	; Move to front left corner

M400
M291 P"Adjust point 1 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension." R"Adjustment Point 1" S2 Z1

; Move to leveling point 2
G1 Z2			; Move to Z2 for clearance
G1 X195 Y195 F6000	; Move to rear right corner

M400
M291 P"Adjust point 2 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension." R"Adjustment Point 2" S2 Z1

; Move to leveling point 3
G1 Z2			; Move to Z2 for clearance
G1 X195 Y25 F6000	; Move front right corner

M400
M291 P"Adjust point 3 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension." R"Adjustment Point 3" S2 Z1

; Move to leveling point 4
G1 Z2			; Move to Z2 for clearance
G1 X26 Y195 F6000	; Move rear left corner

M400
M291 P"Adjust point 4 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension." R"Adjustment Point 4" S2 Z1

; Move nozzle to center of bed at z10
;
M291 P"Nozzle will now move to center of bed to reset Z0" S3
G1 Z1			; Drop bed for nozzle clearance
;G1 X112.5 Y112.5 Z2 F4000	; Move to bed center
M98 P/macros/general/1_Center_Nozzle ;P define the parameter and is not part of the name

; Reset z to 5 to allow jogging up to touch bed to nozzle
;
G92 Z5

; Dialog to allow user to jog z to touch nozzle to bed gently and then move Z down 10
;
M564 S0         ; To allow movement lower than where the firmware thinks Z=0 is.
M291 P"Jog the Z Axis until the bed and nozzle are touching and click OK" R"Setting Z=0" Z1 S3
G92 Z0			; Set z = 0
G1 Z1			; Drop bed for nozzle clearance

M291 P"The bed has been mechanically leveled and Z0 set." S2

; Tone to get user attention
;
M400			; Clear movement buffer so tones play reliably
M300 S666 P600
G4 P601
M300 S1511 P300
G4 P301

M291 P"Probing complete. Turning off heaters and homing axis."
; Turn off heaters
; 
M104 S0		; Set nozzle to 0 and release
M140 S0		; Set bed to 0 and release
G28 XY		; Home XY

; Set normal settings after stall detection probing
;
M98 P/macros/general/Normal_Settings ;P define the parameter and is not part of the name

; Tone to get user attention
M400			; Clear movement buffer so tones play reliably
M300 S666 P600
G4 P601
M300 S1511 P300
G4 P301

M291 P"Run Trigger Height Macro to determine trigger height"
M929 S0 ; stop logging

mitch

@mitch said in PT100 sensor on Duet2 sporadically hunting for target temp:

M98 P/macros/general/1_Center_Nozzle

This is just acting really strange. I can put the lines into the console one by one starting at line 79 and it all works fine. But when I run the macro it just seems to get to around Line 79 and then just exit. No errors or warnings.

jay_s_uk

you don't have your macro in line 80 in ""

@mitch said in PT100 sensor on Duet2 sporadically hunting for target temp:

M98 P/macros/general/1_Center_Nozzle move to bed center

M98 P"/macros/general/1_Center_Nozzle"

mitch

After trying numerous times the macro just started running. Part way through I got the heater fault.

Log:

2021-02-28 10:59:51 [info] Event logging started at level debug
2021-02-28 10:59:51 [info] Running: Duet Ethernet 1.02 or later: 3.2 (2021-01-05)
2021-02-28 10:59:51 [info] M291: - WARNING - Grid bed compensation map will be disabled. Ok or Cancel?
2021-02-28 10:59:53 [info] M292: cancelled: false
2021-02-28 10:59:53 [info] M291: - Preheat and Home - Bed and nozzle will preheat and home all axis.
2021-02-28 10:59:54 [info] M292: cancelled: false
2021-02-28 11:00:15 [debug] {"beep_freq":666,"beep_length":500}
2021-02-28 11:00:16 [debug] {"beep_freq":1111,"beep_length":300}
2021-02-28 11:00:16 [info] M291: - [no title] - Preheating the bed to 60 and nozzle to 210 for accurate probing
2021-02-28 11:00:35 [info] M291: - [no title] - Nozzle will now move to center of bed and move close to the bed
2021-02-28 11:00:36 [info] M291: - Setting Z=0 - Carefully Jog the Z Axis until the bed and nozzle are touching and click OK
2021-02-28 11:01:16 [info] M292: cancelled: false
2021-02-28 11:01:16 [info] M291: - [no title] - Nozzle will now move to the 4 leveling points twice.
2021-02-28 11:01:18 [info] M291: - Adjustment Point 1 - Adjust point 1 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension.
2021-02-28 11:03:00 [info] M292: cancelled: false
2021-02-28 11:03:03 [info] M291: - Adjustment Point 2 - Adjust point 2 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension.
2021-02-28 11:04:05 [info] M292: cancelled: false
2021-02-28 11:04:07 [info] M291: - Adjustment Point 3 - Adjust point 3 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension.
2021-02-28 11:04:45 [info] M292: cancelled: false
2021-02-28 11:04:48 [info] M291: - Adjustment Point 4 - Adjust point 4 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension.
2021-02-28 11:05:36 [info] M292: cancelled: false
2021-02-28 11:05:36 [info] M291: - [no title] - The adjustment sequence will now repeat for fine adjustment.
2021-02-28 11:05:38 [info] M291: - Adjustment Point 1 - Adjust point 1 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension.
2021-02-28 11:06:21 [info] M292: cancelled: false
2021-02-28 11:06:24 [info] M291: - Adjustment Point 2 - Adjust point 2 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension.
2021-02-28 11:06:38 [info] M292: cancelled: false
2021-02-28 11:06:40 [info] M291: - Adjustment Point 3 - Adjust point 3 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension.
2021-02-28 11:07:13 [info] M292: cancelled: false
2021-02-28 11:07:16 [info] M291: - Adjustment Point 4 - Adjust point 4 by using jog to lower nozzle to 0, then use the bed height knobs and a piece of paper to tweak tension.
2021-02-28 11:07:21 [warn] Error: Heater 1 fault: temperature excursion exceeded 15.0°C (target 210.0°C, actual 225.8°C)
2021-02-28 11:07:23 [info] M292: cancelled: false
2021-02-28 11:07:23 [info] M291: - [no title] - Nozzle will now move to center of bed to reset Z0
2021-02-28 11:07:30 [info] M292: cancelled: false
2021-02-28 11:07:32 [info] M291: - Setting Z=0 - Jog the Z Axis until the bed and nozzle are touching and click OK
2021-02-28 11:10:40 [info] M292: cancelled: false
2021-02-28 11:10:40 [info] M291: - [no title] - The bed has been mechanically leveled and Z0 set.
2021-02-28 11:11:01 [info] M292: cancelled: false
2021-02-28 11:11:01 [debug] {"beep_freq":666,"beep_length":600}
2021-02-28 11:11:02 [debug] {"beep_freq":1511,"beep_length":300}
2021-02-28 11:11:02 [info] M291: - [no title] - Probing complete. Turning off heaters and homing axis.
2021-02-28 11:11:17 [debug] {"beep_freq":666,"beep_length":600}
2021-02-28 11:11:17 [debug] {"beep_freq":1511,"beep_length":300}
2021-02-28 11:11:18 [info] M291: - [no title] - Run Trigger Height Macro to determine trigger height
2021-02-28 11:11:18 [info] Event logging stopped

mitch

@jay_s_uk Thanks,

I updated the file. Seems to still run the same. But I will make sure to find all the macros that have this command and add the quotes.

Just seems like sporadic behavior.

mitch

This may be a combination of some macro issues due to recent firmware updates as well as an intermittent connection near the hotend probe.

Thanks for the help. I am going to try to nail down the probe issue first to start to rule out some variables and make this easier to figure out.

Veti

post a picture of the temperature graph

mitch

I am attempting to run a print right now. The blips in the graph are heater faults I have had to clear. The temp just seems to stay on and then drift, clear it, it works again. Not spikes to 2000 or anything like that.

Veti

those are spikes none the less.

this points to either noise in the pt100 cabling. try to isolate the cables from other cables especially motor cables.

mitch

The PT100 wire is not twisted pair. It is just a straight through cable. However, all of the motor cables are in fact twisted pair.

Is tearing this wire bundle apart and using twisted pair for the PT100 sensor a necessity? If that would eliminate this issue I have not problem doing it. But it is quite the task if it isn't usually necessary.

Veti

for now just run the wire separate and see if the problem persists.

mitch

@Veti Ok, doing that now. I know I read something somewhere about 4wire vs 2wire on the PT100. Right now I am just running a straight 2wire.

Running a separate twisted 2wire now.

mitch

Well, so far so good. I ran a twisted pair and terminated new connectors. One of the two seemed to have fixed this issue for now. Thanks for the help.

Phaedrux

4 wire PT100 is the way to go if you can manage the wiring. I run a 4 wire setup with the two pairs twisted. It runs through a bundle with 2 fans, an extruder stepper, and the heater, for a meter and a half and it's been solid.

dc42

@mitch said in PT100 sensor on Duet2 sporadically hunting for target temp:

I recently changed to the E3D PT100 sensor and Daughterboard. The temps seem to be correct for the hotend but it has a hard time staying on temp. It seems to hunt around the target temp with a variance of about 0.1 - 0.9C even after a PID tune.

Regular oscillations about the target temperature when the print head is stationary suggest that the actual dead time of your hot end is higher than the M307 value. So try increasing the D parameter in your M307 command by about 25%.

Random fluctuations when the head is stationary are more likely to be caused by a bad connection, or by interference from stepper motor wires.